Quite the contrary, sabermetrics allows us to see what great players there were such as Jackie Robinson who is a "saber" dream. Most people know very little about what kind of player he was except that he was a terror on the basepaths. He is precisely the type guy whose value is shown best with advanced metrics with his over .400 career OBP and relatively high steal totals in the lowest basestealing era of all time. He had mid power but did drive in respectable RBI totals. He played multiple positions extremely well. Yet if you look at his career totals they are not that eyecatching because of his relatively short career due to discrimination.
By advanced metrics Robinson is shown to be a GREATER player than most people thought he was. He got in the Hall of Fame not only for breaking the color line, but for being a truly great player for ten years.
Sabermetrics isn't a box, it is infinite in its applications. The box is judging someone on how many RBI's they had or what there batting average was, ignoring whether they truly get on base a lot.